Update in `phosim_repackager.py` the repackaged FITS header `ROTANG`  , so that the correct WCS is achieved. Currently, one needs to feed `90+/-ROTANG` to `lsst.obs.base.createInitialSkyWcsFromBoresight` to achieve the match. An illustration (attached) shows a simulated `lsstCam` defocal image, with red circles corresponding to locations of stars inferred from the input catalog assuming `90+ROTANG`

minimal code used to make the image is attached-  wcs_code.py

Crucial part is

new_wcs = createInitialSkyWcsFromBoresight(pointing_loc, 

 (postIsr_md['ROTANG']+90)*lsst.geom.degrees,

 exposure.getDetector(),

 flipX=False,)

since we desire to be able to use just   {{postIsr_md['ROTANG'] }}, without adding 90 degrees to make the input catalog match the WCS information.